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Finding the Fourth Proportional to 702.24, 968.23 and 639.81

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Solution

The fourth proportional to 702.24, 968.23 and 639.81 is: 882.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.24 : 968.23 = 639.81 : x
  2. Step 2: Convert to fraction form
    702.24/968.23 = 639.81/x
  3. Step 3: Cross multiply
    702.24x = 968.23 × 639.81
  4. Step 4: Simplify right side
    702.24x = 619,483.24
  5. Step 5: Solve for x
    x = 619,483.24/702.24
  6. Step 6: Final answer
    x = 882.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.